比如，信件上用“致”和“ 来自” 代替了地址和签名部分。

"To" and "From" replace a letter's inside address and signature block, for example.

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利用该键，您可丢弃组成员、阻塞或者取消阻塞来自特定地址的数据报、以及返回有关组和通道的消息。

Using the key you can drop the membership, block and unblock datagrams from certain addresses, and return information about the group and channel.

youdao

第三条命令指定该规则将与除来自源地址203.16.1.89外的任何信息包匹配。

The third command specifies that this rule will match any packets not from source address 203.16.1.89.

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